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Flaigg, Norman G.
Packera glabella (Poir.) C. Jeffrey
Butterweed, Cress-leaf groundsel, Yellowtop
Synonym(s): Senecio glabellus, Senecio lobatus
USDA Symbol: pagl17
USDA Native Status: L48 (N), CAN (W)
An upright, smooth, succulent annual, 18-20 in. high. Stout stems may be branched or unbranched and are topped by a large, cluster of yellow, daisy-like flowers. Interesting leaves are deeply-divided in rounded segments or lobes and become smaller toward the upper portion of the plant. Usually forms large colonies in the moist-to-wet habitat it prefers.
Though an annual, Packera glabella usually seeds out so densely that it achieves the same groundcover effect as many of the perennial Packera species. Unlike some of those better known perennials, this species can bloom in either sun or shade, as long as it is situated in a moist site. The leaves emerge in the fall and add low winter green to the landscape. Blooms are profuse, filling its colonies with yellow throughout the spring months.
Plant CharacteristicsDuration: Annual Habit: Herb Leaf:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Mar , Apr , May
, TX Canada: ON Native Distribution:
Ontario, NC, OH,
s. IL, MO,
& s.e. NE,
s. to FL, TX
& e. KS Native Habitat:
Damp, open woods; swampy grasslands
Growing ConditionsWater Use: High
Light Requirement: Sun , Part Shade
Soil Moisture: Moist
CaCO3 Tolerance: High
Drought Tolerance: Low
Soil Description: Moist, alluvial soils.
Conditions Comments: As long as soil is at least moist, can grow in shade or sun.
BenefitUse Ornamental: Provides dense, yellow, spring blooms to wet sites throughout its range.
Use Wildlife: Attracts bees and butterflies.
Conspicuous Flowers: yes
Nectar Source: yes
PropagationPropagation Material: Seeds
Commercially Avail: yes
Maintenance: Allow to self-sow for continuous populations each year.
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2013-09-09
Research By: TWC Staff